Hydrogen Embrittlement of Ultrafine-grained Austenitic Stainless Steels Processed by High-pressure Torsion at Moderate Temperature

• Mine Yoji

  Department of Materials Science and Engineering, Kumamoto University

• Haraguchi Daisuke

  Department of Materials Science and Engineering, Kyushu University

• Ideguchi Takahiro

  Department of Materials Science and Engineering, Kumamoto University

• Horita Nobuaki

  Department of Materials Science and Engineering, Kumamoto University

• Horita Zenji

  Department of Materials Science and Engineering, Kyushu University WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University

• Takashima Kazuki

  Department of Materials Science and Engineering, Kumamoto University

Bibliographic Information

Other Title

• Hydrogen embrittlement of ultrafine-grained austenitic stainless steel processed by high-pressure torsion at moderate temperature

Abstract

The effect of hydrogen on the plasticity of ultrafine-grained austenite was studied on type 304, 316L, and 310S stainless steels processed by high-pressure torsion at moderate temperature. Like austenitic steels with ordinary grain sizes, the hydrogen-induced ductility loss for the ultrafine grains became more pronounced with decreasing stability of the austenitic phase. For all the steels, the uniform elongation was limited by strengthening due to the ultra grain refinement; the ultrafine-grained 310S stable austenitic steel further exhibited a small local elongation due to a lack of martensitic transformation. The ductility loss due to hydrogenation for 316L steel with an intermediate austenite stability was retained to a moderate level. The ultrafine-grained 304 metastable austenitic steel exhibited a serious ductility loss induced by hydrogen showing localised shear deformation. This suggests that the dynamic martensite transformation plays a crucial role in the hydrogen embrittlement of ultrafine-grained metastable austenitic steel.

Journal

• ISIJ International

  ISIJ International 56 (6), 1083-1090, 2016

  The Iron and Steel Institute of Japan

Keywords

• hydrogen embrittlement
• ultrafine grains
• austenitic stainless steels
• martensitic transformation
• high-pressure torsion
• micro-tensile testing

Details

• CRID: 1390282681463023232
• NII Article ID: 130005164510
• DOI: 10.2355/isijinternational.isijint-2015-664
• ISSN: 13475460
• ISSN: 09151559
• Web Site: https://www.jstage.jst.go.jp/article/isijinternational/56/6/56_ISIJINT-2015-664/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed